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Water wettabilities of the as-prepared rough and the F-rough surfaces, respectively. (a, b) Images of a water droplet on the as-prepared surfaces: (a) the rough surface and (b) the F-rough surface. (c, d) Wetting states of a water droplet on the rough and the F-rough substrates: (c) Wenzel state and (d) Cassie state. (e, f) Photographs of the as-prepared samples in water: (e) the rough surface and (f) the F-rough surface.
